Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1992-01-23
1992-10-27
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 25, 367 31, 181103, 3408538, G01V 140
Patent
active
051595788
ABSTRACT:
A borehole logging tool having a dipole acoustic energy source and at least one spaced-apart dipole acoustic energy receiver is lowered into a deviated borehole. A motor rotates the source and receiver about the axis of the borehole tool. A first signal is produced representing source and receiver rotational position relative to a vertical direction. A second signal is produced representing a fixed reference level. A comparator produces a third signal of the difference between the first and second signals. The motor rotates so as to minimize such third signal, thereby maintaining the focus of the source and receiver in a horizontal direction that is perpendicular to the direction of eccentricity of the borehole tool with respect to the borehole axis.
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"Eccentric dipole sources in fluid-filled boreholes: Numerical and Experimental results", H. D. Leslie and C. J. Randall, J. Acoust. Soc. Am., Jun. 1990, pp. 2405-2421.
Dennis Charles L.
Lenhardt Will K.
Schmitt Denis P.
Hager Jr. George W.
Lobo Ian J.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
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